As per Weaselboy, the flash portion should always be full or nearly so, but what its full with will change, so there is no point knowing what with, and the only thing that will change is how full the hard disk part is as you gain or remove data.

I have just loaded lots of data onto my fusion drive and I am wondering if there is any way to know how full each drive is.

Thank you.

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The OS tries to have the SSD drive full except for 4 GB that are used as a write cache. When you write data the write cache is filled; when you stop writing the OS empties the write cache so that the SSD drive has 4 GB free again. If you delete data that happens to be on the SSD drive, then the OS fills it up again with data from the hard drive when you stop using the drive for a second.

Staff Member

It will tell the actual used space for each partition. Can't remember if the first one will give the individual components for a fusion drive or not.

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That will show the total space used by the Fusion logical volume, but it does not break it down by the individual, physical disks. It will just show the size of each physical disk, but not space free/used.

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